| The effects of photoperiod on the switching of myometrial contractility patterns of pregnant baboons: relationship to surgery and parturition. | |
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MedLine Citation:
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PMID: 11839505 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: Pregnant baboons were studied to determine the precise time of the switch from myometrial contractures to contractions in relation to photoperiod after laparotomy and at parturition. We compared the patterns recorded in baboons to those we have previously reported in pregnant rhesus monkeys to determine fundamental primate characteristics. METHODS: Seven pregnant baboons (126-160 days' gestation) were instrumented with femoral arterial and venous catheters and electrodes for myometrial electromyogram. All animals were subjected to a 14-hour light:10-hour dark photoperiod. Myometrial activity was monitored using a computer-based data acquisition system. Onset time for all switches was noted and standardized against time of lights off. Animals were studied at three stages of pregnancy (stage 1, first 10 days after laparotomy; stage 2, more than 10 days after laparotomy and more than 10 days before cesarean; and stage 3, 10 days before cesarean section or vaginal delivery). RESULTS: All baboons demonstrated myometrial switches for a variable number of days preceding parturition. Onset of darkness was 0 hours. Average time of stage 1 switch onset was 2.17 +/- 0.60 hours and was not different from stage 3 switch onset, which was -1.00 +/- 0.27 hours. CONCLUSIONS: Myometrial contractile patterns showed clear photoperiodicity in the switch from contractures to contractions in late pregnancy in the baboon. The relationship of the switch from contractures to contractions was not altered by surgical laparotomy. There was a significant difference in the time of switch in relation to photoperiod between pregnant rhesus monkeys and baboons. However, the fact that a significant photoperiod exists in both species indicates a fundamental similarity in the switch from contractures to contractions in primate pregnancy. |
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Authors:
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Ann M Bievenue; Susan L Jenkins; Peter W Nathanielsz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of the Society for Gynecologic Investigation Volume: 9 ISSN: 1071-5576 ISO Abbreviation: J. Soc. Gynecol. Investig. Publication Date: 2002 Jan-Feb |
Date Detail:
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Created Date: 2002-03-06 Completed Date: 2002-05-22 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 9433806 Medline TA: J Soc Gynecol Investig Country: United States |
Other Details:
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Languages: eng Pagination: 27-31 Citation Subset: IM |
Affiliation:
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Laboratory for Pregnancy and Newborn Research, Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853-6401, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Electromyography / veterinary Female Laparotomy / veterinary Papio / physiology*, surgery Photoperiod Pregnancy Pregnancy, Animal / physiology* Uterine Contraction / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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HD 21350/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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